Question: A neutron-activated sample emits gamma rays at energies that are consistent with the decay of mercury-198 nuclei from an excited state to the ground state.

A neutron-activated sample emits gamma rays at energies that are consistent with the decay of mercury-198 nuclei from an excited state to the ground state. If the reaction that takes place is n + (?) → 198Hg+ + e− + n-, what is the nuclide "(?)" that was present in the sample before neutron activation?

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